介绍

Java图形验证码工具，支持gif（动图）、中文、算术等类型，可用于Java Web、JavaSE等项目。

快速开始

导入依赖

 <dependency><groupId>com.github.whvcse</groupId><artifactId>easy-captcha</artifactId><version>1.6.2</version></dependency>

静态验证码

 @GetMapping("/captcha123")public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {// 设置请求头为输出图片类型response.setContentType("image/gif");response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0);​// 三个参数分别为宽、高、位数SpecCaptcha specCaptcha = new SpecCaptcha(130, 48, 5);// 设置字体（有默认字体，可以不用设置）specCaptcha.setFont(new Font("Verdana", Font.PLAIN, 32));// 设置类型，字母数字混合specCaptcha.setCharType(Captcha.TYPE_DEFAULT);// 获取验证码内容String code = specCaptcha.text().toLowerCase()// 输出图片流specCaptcha.out(response.getOutputStream());}

动态验证码

 @RequestMapping("/captcha123")public void captcha2(HttpServletRequest request, HttpServletResponse response) throws Exception {// 设置请求头为输出图片类型response.setContentType("image/gif");response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0);// 三个参数分别为宽、高、位数GifCaptcha gifCaptcha = new GifCaptcha(130,48,4);// 获取验证码String code = gifCaptcha.text().toLowerCase();// 输出图片流gifCaptcha.out(response.getOutputStream());}

中文验证码

@RequestMapping("/captcha123")
public void captcha2(HttpServletRequest request, HttpServletResponse response) throws Exception {// 设置请求头为输出图片类型response.setContentType("image/gif");response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0);// 三个参数分别为宽、高、位数ChineseCaptcha chineseCaptchaAbstract = new ChineseCaptcha(130,28,4);// 获取验证码String code = chineseCaptchaAbstract.text().toLowerCase();// 输出图片流chineseCaptchaAbstract.out(response.getOutputStream());
}

动态中文验证码

@RequestMapping("/captcha123")
public void captcha2(HttpServletRequest request, HttpServletResponse response) throws Exception {// 设置请求头为输出图片类型response.setContentType("image/gif");response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0);// 三个参数分别为宽、高、位数ChineseGifCaptcha chineseGifCaptchaAbstract = new ChineseGifCaptcha(130,28,4);// 获取验证码String code = chineseGifCaptchaAbstract.text().toLowerCase();// 输出图片流chineseGifCaptchaAbstract.out(response.getOutputStream());
}

算数验证码

@RequestMapping("/captcha123")
public void captcha2(HttpServletRequest request, HttpServletResponse response) throws Exception {// 设置请求头为输出图片类型response.setContentType("image/gif");response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0);// 三个参数分别为宽、高、位数ArithmeticCaptcha arithmeticCaptcha = new ArithmeticCaptcha(130 , 28 , 4);// 获取验证码String code = arithmeticCaptcha.text().toLowerCase();// 输出图片流arithmeticCaptcha.out(response.getOutputStream());
}

验证码字符类型

类型	描述
TYPE_DEFAULT	数字和字母混合
TYPE_ONLY_NUMBER	纯数字
TYPE_ONLY_CHAR	纯字母
TYPE_ONLY_UPPER	纯大写字母
TYPE_ONLY_LOWER	纯小写字母
TYPE_NUM_AND_UPPER	数字和大写字母

SpecCaptcha captcha = new SpecCaptcha(130, 48, 5);
captcha.setCharType(Captcha.TYPE_ONLY_NUMBER);

字体设置

字体	效果
Captcha.FONT_1
Captcha.FONT_2
Captcha.FONT_3
Captcha.FONT_4
Captcha.FONT_5
Captcha.FONT_6
Captcha.FONT_7
Captcha.FONT_8
Captcha.FONT_9
Captcha.FONT_10

SpecCaptcha captcha = new SpecCaptcha(130, 48, 5);// 设置内置字体
captcha.setFont(Captcha.FONT_1); // 设置系统字体
captcha.setFont(new Font("楷体", Font.PLAIN, 28)); 

 图片输出到文件

FileOutputStream outputStream = new FileOutputStream(new File("C:/captcha.png"))
SpecCaptcha specCaptcha = new SpecCaptcha(130, 48, 5);
specCaptcha.out(outputStream);